Nobody is winning nationals, shooting minor? At the club level, it would certainly be possible to win matches shooting minor, loading only seven, or whatever you want to do, depending on the competition. I won a local match shooting Limited with a single stack .45 loaded 10+1, but I would agree with anyone who said, "Nobody is winning Limited with a single stack"!
Club level matches sometimes are a bit deceiving.
We have one guy out at our local club that is a GM in Production and Limited (still is "only" M in Single-stack though) who is shooting SS Major - 8 rounds per mag - and is beating most of the scores of the Open shooters. On the OVERALL match results (and out of 50+ shooters) he's always in the top 5 shooting iron sights and 8 per mag.
Even that guy though still isn't winning SS nationals.